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dc.contributor.authorYoung, Melissaen_US
dc.date.accessioned2013-07-23T18:23:47Z
dc.date.available2016-06-01T06:15:40Z
dc.date.issued2011-01-31en_US
dc.identifier.otherbibid: 8213865
dc.identifier.urihttps://hdl.handle.net/1813/33570
dc.description.abstractIron deficiency anemia is the most common nutrient deficiency in the world , with highest rates in pregnant women and young children. Despite the magnitude and severity of iron deficiency, there remains gaps in our knowledge of iron metabolism. Hepcidin is a key regulator of iron homeostasis yet limited data is available on its role during pregnancy. Although our knowledge of non-heme iron metabolism has increased substantially in recent years, the mechanisms regulating heme iron metabolism remain elusive. The overall goal o f this research is to further understand the primary determinants of iron absorption and placental iron transfer in women of childbearing age. To address these issues stable iron isotopes (57Fe and 58Fe) were used to measure iron absorption in non-pregnant (ages 18-32 years, n = 30) and pregnant (ages 16-32 years, n = 20) subjects and placental iron transfer in pregnant women. Nonheme iron absorption was inversely associated with iron status and serum hepcidin. However, heme iron absorption was not signif icantly associated with serum hepcidin or iron stores, suggesting differential regulation. In a subset of 18 non-pregnant subjects serum prohepcidin (hepcidin precursor) was also assessed but was not significantly associated with measures of iron absorptio n or serum hepcidin. Both pregnant and non-pregnant women absorbed significantly more iron from a heme based meal compared to a non-heme iron supplement. Interestingly there also appears to be preferential fetal utilization of maternally ingested heme iron compared to nonheme iron during pregnancy. Iron status in the maternal-neonatal dyad and maternal serum hepcidin were inversely associated with heme and non-heme placental iron transfer. In a cohort of 92 pregnant adolescents (ages 14-18 years), the placental protein expression of transferrin receptor was likewise increased in response to altered iron stores in the mother and neonate. Despite increased iron absorption by women during pregnancy, placental iron transporter expression and placental iron tr ansfer, many of the mothers and the neonates had suboptimal iron status at the time of delivery. Based on study results, further research on the mechanisms of heme iron metabolism and mechanisms of placental iron transfer are warranted.en_US
dc.language.isoen_USen_US
dc.subjectIronen_US
dc.subjectPregnancyen_US
dc.subjectHepcidinen_US
dc.titleIron Absortpion In Pregnant And Non-Pregnant Women And Mechanisms Of Placental Iron Transferen_US
dc.typedissertation or thesisen_US
thesis.degree.disciplineNutrition
thesis.degree.grantorCornell Universityen_US
thesis.degree.levelDoctor of Philosophy
thesis.degree.namePh. D., Nutrition
dc.contributor.chairO'Brien, Kimberly Oen_US
dc.contributor.committeeMemberHaas, Jere Douglasen_US
dc.contributor.committeeMemberPinstrup-Anderson, Peren_US
dc.contributor.committeeMemberOlson, Christine Marieen_US


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